compression on mercury 200
#6
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Platinum Member
An 87 finger-ported 2.4 should show 120 to 130. As was said, 5 lbs variation is acceptable.
You can cut the heads to 145 with no worries on pump gas, but above that you'll need to remove the ignition advance module (it just unplugs).
You can cut the heads to 145 with no worries on pump gas, but above that you'll need to remove the ignition advance module (it just unplugs).
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DaveP
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01-24-2002 12:38 AM